Avoid collecting headers from several reqeusts in case of redirect.
Avoid collecting headers from several reqeusts in case of redirect.

BUG=http://crbug.com/62665
TEST=manual -- see bug description
Review URL: http://codereview.chromium.org/4732007


git-svn-id: http://src.chromium.org/svn/trunk/src@65682 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 6a95d497d19678c479d1fca0be146da65ca417c7
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser